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Carb to TBI Conversion

Discussion in 'TBI & EFI Conversions' started by Kilian, Oct 23, 2019.

  1. Kilian

    Kilian Full Access Member

    Posts:
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    Joined:
    Mar 25, 2018
    Location:
    Wisconsin
    First Name:
    K
    Truck Year:
    1983
    Truck Model:
    C2500
    Engine Size:
    350
    I acquired an 87 1/2 ton parts truck for doing an AC conversion on my 83 3/4 ton GMC, and am now wondering about the TBI setup in the parts truck.

    Are TBI setups in demand enough that it's worth trying to salvage and sell?

    Is it worth converting the 4BBL carb setup in the 83 to TBI? As there is a whole forum on this topic, what are the benefits of going with TBI compared to a carb? Both trucks have 350s, but I don't know anything about the 350 in the parts truck other than the TBI setup should be complete.

    Don't know much about TBI, so just thought I'd ask a couple of questions on the topic. Thanks for the help.
     
  2. 1987 GMC Jimmy

    1987 GMC Jimmy Automobile Hoarder

    Age:
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    Location:
    Mississippi
    First Name:
    Jesse
    Truck Year:
    1987
    Truck Model:
    V1500 Jimmy
    Engine Size:
    350
    I think you could find a buyer for the TBI setup. It’s not a super lucrative market, but there are enough people who want TBI or have TBI systems that are so hacked up, they want a fresh start so they can keep it TBI. That being said there are more people going simpler than more complex. Either way, TBI made a big enough splash that it and the aftermarket, wet manifold EFI it inspired aren’t going anywhere anytime soon.

    As far as you converting goes, I would say if you’re not having issues, let it be, but maybe hold onto your parts if you decide not to sell. The best thing about carb/HEI is its simplicity. You absolutely cannot beat it. TBI is simple in the grand scheme, but it’s not anything like a good carb. The best thing about TBI is it’s startability, general drivability, and its more formulaic way for diagnosing and repairing issues. When it’s really cold, my carb can be a little testy but not bad. When it’s hot outside, it heat soaks and vapor locks. When it sits for a few days or a week, it can be a little stubborn. This is an unmolested factory system, mind you.

    The TBI pops off every time no matter the temperature or time sitting. The thing I like about my carb is I’ve never had issues that lingered for a long time without solving them. TBI issues develop complex issues sometimes that require a working knowledge of the wiring, how the sensors work independently and in relation to one another, and what certain symptoms of a problem generally translate to. It all depends. I know a guy with a ‘93 Suburban with around 300,000 miles. Original everything, just oil changes and tires. I’ve had a issues crop up on mine with 183,000 miles that came from POs using cheap ignition parts and damaging other parts when they fail. You just have to be a responsible owner and not skimp where it counts.
     
    85squaredC10, 68post and Snoots like this.
  3. 85squaredC10

    85squaredC10 Junior Member

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    Location:
    Wisconsin
    First Name:
    Jason
    Truck Year:
    1985
    Truck Model:
    C10
    Engine Size:
    350 TBI
    I did a swap from a 85 350 quadrojet carburetor to 93 350 TBI. I absolutely love it. No more starting issues...obd tells me if there are issues...better gas mileage (not much more, but noticable)..I couldnt be happier. Did it all myself as my first swap ever.....it was a hard and tedious learning experience. The donor engine was in pretty rough shape, so I needed a complete gasket rebuild and almost all sensors were replaced. But it runs great now for better part of 3 years with little, to no issues. Mostly, when I first did the swap, I did not understand that it needed a different gas tank for fuel injection. So I struggled with running the injectors dry a few times before I switched it out. But in the long run, i feel it has more on demand power and dependability all round.

    Sent from my SM-G965U1 using Tapatalk
     
    Angie K likes this.

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